How to unlock All Cars
Go to the main menu and press Up, Down, Right, Right, Left, Up, Up, Down

Get All Tracks
Go to the main menu and press Up, Up, left, Down, Left, Right, Right

Get Arcade Championship
Go to the main menu and press Right, left, Up, Right, Down, Down, Left,, Left

Get Story Mode
Go to the main menu and press Down, Left, up, Right, Right, Up, Down, left

Get Multi Player Championship
Go to the main menu and press Left, Down, Left, Up, Right, Left, Down, Right